A110025 Smallest primes starting a complete three iterations Cunningham chain of the first or second kind.

509, 1229, 1409, 2131, 2311, 2699, 3539, 6211, 6449, 7411, 10321, 10589, 11549, 11909, 12119, 17159, 18121, 19709, 19889, 22349, 22531, 23011, 24391, 26189, 27479, 29671, 30389, 31771, 35311, 41491, 43649, 46411, 54601, 55229, 56311

Offset

1,1

Comments

Terms computed by Gilles Sadowski.

Links

Table of n, a(n) for n=1..35.

Chris Caldwell's Prime Glossary, Cunningham chains.

Formula

Union of A059763 and A110024. [R. J. Mathar, May 08 2009]

Example

1409 is here because, through the operator <2p+1> for chains of the first kind, 1409 -> 2819 -> 5639 -> 11279 and the chain ends here.
2131 is here because, through the operator <2p-1> for chains of the second kind, 2131 -> 4261 -> 8521 -> 17041 and the chain ends here.

Crossrefs

Cf. A023272, A023302, A023330, A005384, A005385, A059452, A059455, A007700.

Cf. A059759, A059760, A059761, A059762, A059763, A059764, A059765, A038397, A104349, A091314, A069362, A016093, A014937, A057326.

Sequence in context: A142819 A183058 A256709 * A059763 A031421 A255183

Adjacent sequences: A110022 A110023 A110024 * A110026 A110027 A110028

Keyword

easy,nonn

Author

Alexandre Wajnberg, Sep 03 2005

Extensions

Edited by R. J. Mathar, May 08 2009

Status

approved